{"id":914,"date":"2026-03-08T20:40:40","date_gmt":"2026-03-08T20:40:40","guid":{"rendered":"https:\/\/pennaero.com\/mac-fasteners\/?post_type=trm_product_page&#038;p=914"},"modified":"2026-03-08T20:40:40","modified_gmt":"2026-03-08T20:40:40","slug":"internal-wrenching","status":"publish","type":"trm_product_page","link":"https:\/\/pennaero.com\/mac-fasteners\/products\/internal-wrenching\/","title":{"rendered":"Internal Wrenching"},"content":{"rendered":"\n<section id=\"\" class=\"section padding-vertical-md  has-background-image\" style=\"background: linear-gradient(270deg, rgba(10, 10, 10, 0.00) 0%, #0a0a0a 100%), url(https:\/\/pennaero.com\/mac-fasteners\/wp-content\/uploads\/sites\/18\/2026\/03\/423f81ef6b8b34a1d1d4a35cfaa45d27b80ef276-1.png) lightgray center\/cover no-repeat;\">\n  <div class=\"container layout-flex\">\n    <div class=\"acf-innerblocks-container\">\n\n<div class=\"hero  \">\n    <h1>Internal Wrenching<\/h1>\n  \n    <div class=\"text-container\">\n    <p>Compact-drive fasteners engineered for low-profile aerospace installations.<\/p>\n  <\/div>\n  \n  <div class=\"buttons\">\n        <a class=\"button button-primary button-one\" href=\"https:\/\/pennaero.com\/mac-fasteners\/contact-us\/\" target=\"_self\">Contact Us<\/a>\n    \n        <a class=\"button button-secondary button-two button-outline\" href=\"https:\/\/pennaero.com\/mac-fasteners\/our-products\/\" target=\"_self\">All Products<\/a>\n      <\/div>\n<\/div>\n\n<\/div>  <\/div>\n<\/section>\n\n\n\n<section id=\"\" class=\"section padding-vertical-md  background-color-none\">\n  <div class=\"container layout-flex\">\n    <div class=\"acf-innerblocks-container\">\n\n<div class=\"grid-wrap grid-2-columns grid-55-45 gap-xl\">\n  <div class=\"acf-innerblocks-container\">\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-ab686fcb wp-block-group-is-layout-flex\">\n<p class=\"has-large-font-size wp-block-paragraph\"><strong><strong>MAC MS internal wrenching fasteners are designed for assemblies where external wrench flats are impractical. <\/strong><\/strong><\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">Featuring internal hex or spline drive configurations, these fasteners provide secure tool engagement and efficient torque application in confined or aerodynamic environments.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-ab686fcb wp-block-group-is-layout-flex\">\n<h2 class=\"wp-block-heading\">Key Features<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Manufactured to MS aerospace specifications<\/strong><\/li>\n\n\n\n<li><strong>Internal hex or spline drive<\/strong><\/li>\n\n\n\n<li><strong>Compact head geometry<\/strong><\/li>\n\n\n\n<li><strong>High torque capability<\/strong><\/li>\n\n\n\n<li><strong>Fatigue and corrosion resistance<\/strong><\/li>\n\n\n\n<li><strong>Precision-machined for repeatable installation<\/strong><\/li>\n<\/ul>\n<\/div>\n\n<\/div><\/div>\n\n<\/div>  <\/div>\n<\/section>\n\n\n\n<section id=\"\" class=\"section padding-vertical-md  background-color-white\">\n  <div class=\"container layout-flex\">\n    <div class=\"acf-innerblocks-container\">\n\n<div class=\"grid-wrap grid-2-columns grid-55-45 gap-xl\">\n  <div class=\"acf-innerblocks-container\">\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-ab686fcb wp-block-group-is-layout-flex\">\n<h2 class=\"wp-block-heading\">Available Configurations<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">MAC internal wrenching fasteners are produced across aerospace-standard dimensional ranges with controlled drive geometry.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MS <\/strong>part number coverage<\/li>\n\n\n\n<li><strong>Internal hex and spline drive <\/strong>options<\/li>\n\n\n\n<li><strong>8740 alloy steel<\/strong> material<\/li>\n\n\n\n<li><strong>Thread length and grip variations<\/strong> per specification<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"product-card \">\n  <!-- We want to wrap image in link, if link exists -->\n        \n    <div class=\"card-body\">\n          <div class=\"card-title\">\n      <h2>MS<\/h2>\n    <\/div>\n    \n        <div class=\"card-description\">\n      <p>MS20004-24<\/p>\n    <\/div>\n      <\/div>\n  \n  <div class=\"card-footer\">\n      <\/div>\n<\/div>\n\n\n\n<div class=\"product-card \">\n  <!-- We want to wrap image in link, if link exists -->\n        \n    <div class=\"card-body\">\n          <div class=\"card-title\">\n      <h2>NAS<\/h2>\n    <\/div>\n    \n        <div class=\"card-description\">\n      <p>NAS144-158<\/p>\n    <\/div>\n      <\/div>\n  \n  <div class=\"card-footer\">\n      <\/div>\n<\/div>\n<\/div>\n\n<\/div><\/div>\n\n<\/div>  <\/div>\n<\/section>\n\n\n\n<section id=\"\" class=\"section padding-vertical-md  has-background-image\" style=\"background: linear-gradient(270deg, rgba(10, 10, 10, 0.00) 0%, #0a0a0a 100%), url(https:\/\/pennaero.com\/mac-fasteners\/wp-content\/uploads\/sites\/18\/2026\/03\/6f8d17eaeae8b29d8baa7d332cec13335300ffd8-scaled.jpg) lightgray center\/cover no-repeat;\">\n  <div class=\"container layout-flex\">\n    <div class=\"acf-innerblocks-container\">\n\n<div class=\"flex-wrap flex-1-column gap-md container-width-sm\">\n  <div class=\"acf-innerblocks-container\">\n\n<h2 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-1\">Put Our Capabilities to Work<\/h2>\n\n\n\n<p class=\"has-white-color has-text-color has-link-color wp-elements-2 wp-block-paragraph\">Select MAC internal wrenching fasteners for compact installations requiring controlled torque engagement and production consistency.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/pennaero.com\/mac-fasteners\/contact-us\/\">Contact Us<\/a><\/div>\n<\/div>\n\n<\/div><\/div>\n\n<\/div>  <\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"","protected":false},"template":"","class_list":["post-914","trm_product_page","type-trm_product_page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Internal Wrenching - Mac Fasteners<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pennaero.com\/mac-fasteners\/products\/internal-wrenching\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Internal Wrenching - Mac Fasteners\" \/>\n<meta property=\"og:url\" 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